How to use sed to replace only the first occurrence in a file?

Question

I would like to update a large number of C++ source files with an extra include directive before any existing #includes. For this sort of task, I normally use a small bash s

Answer 1

sed '0,/pattern/s/pattern/replacement/' filename

this worked for me.

example

sed '0,//s//Sub menu<\/Menu>/' try.txt > abc.txt

^{Editor's note: both work with GNU sed only.}